Kourtney Kardashian posted a new picture of her totally fit figure to Instagram on Saturday, posing in the gym with sister Kylie Jenner, writing, "I've been trying to get her to workout with me for six months...today was my lucky day."
In addition to this latest snap, Kourtney also posted several throwback photos from the family's summer vacation in St. Barts, where the 36-year-old reality star stuns in a revealing gold one-piece while riding a fitness bike.
The mama of three has been showing off her body a lot lately -- including a fully naked photo last week that exposed her backside -- at the same time as she finds herself at the center of the rumor mill. Last week, after reportedly trying to "work things out" with her estranged partner, Scott Disick, the reality star was rumored to be seeing 21-year-old pop star Justin Bieber. However, a source told ET the two are "just good friends," adding that Kourtney "wouldn't go there."